<template>
  <view>
    <!-- 自定义搜索组件 -->
    <view class="search-box">
      <my-search @click="gotosearch"></my-search>
    </view>

    <view class="scroll-view-container">
          <!-- 左侧的滚动视图区域 -->
          <scroll-view class="left-scroll-view" scroll-y :style="{height: wh + 'px'}">
            <block v-for="(item,i) in cateList" :key="i">
              <view :class="['left-scroll-view-item', i === active? 'active' : '']" @click="activeChanged(i)">{{item.cat_name}}</view>
            </block>
          </scroll-view>
          
          <!-- 右侧的滚动视图区域盒子 -->
          <scroll-view class="right-scroll-view" scroll-y :style="{height: wh + 'px'}" :scroll-top="scrollTop">
            <!-- 二级列表循环item -->
            <view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
              
              <view class="cate-lv2-title">
                /{{item2.cat_name}}/
              </view>
              
              <!-- 三级列表盒子 -->
              <view class="cate-lv3-list">
                <!-- 三级列表循环item -->
                <view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
                  <!-- 图标 -->
                    <image :src="item3.cat_icon"></image>
                    <!-- 文本 -->
                    <text>{{item3.cat_name}}</text>
                </view>
              </view>
              
            </view>
          </scroll-view>
          
    </view>
  </view>
</template>

<script>
  //导入封装好的mixin模块（购物车tabbar的徽标）
  import badgeMix from '@/mixins/tabbar-badge.js'
  import {mapGetters} from 'vuex'
  export default {
    // 将 badgeMix 混入到当前的页面中进行使用
      mixins: [badgeMix],
    data() {
      return {
        wh:0,
        cateList:[],
        cateLevel2:[],
        active:0,
        scrollTop:0
      };
    },
    onShow() {
      this.setBadge()
    },
    onLoad() {
      const sysInfo = uni.getSystemInfoSync();
      this.wh = sysInfo.windowHeight - 50;
      
      //获取分类列表数据
      this.getCateList()
      
      //更新徽标
      this.setBadge()
      
    },
    methods:{
      async getCateList(){
        const { data: res } = await uni.$http.get('/api/public/v1/categories')
        console.log(res)
        this.cateList = res.message
        this.cateLevel2 = res.message[0].children
      },
      activeChanged(i){
        this.active = i
        this.cateLevel2 = this.cateList[i].children
        this.scrollTop = this.scrollTop === 0 ? 1 : 0
      },
      gotoGoodsList(item3){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?cid=' + item3.cat_id
        })
      },
      gotosearch(){
        console.log('ok')
        uni.navigateTo({
          url:'/subpkg/search/search'
        })
      },
      setBadge(){
        //小程序固有方法，用于为tabBar设置徽标
        uni.setTabBarBadge({
          index:2 ,//购物车在tabBar中的索引值为2
          //text的值必须是字符串，所有这里后面加上一个空字符串，就可以转换为字符串
          text:this.total + '' 
        })
      }
    },
    computed: {
      ...mapGetters('m_cart',['total'])
    },
  }
</script>

<style lang="scss">
.scroll-view-container{
  display: flex;
  .left-scroll-view{
    width: 120px;
    .left-scroll-view-item{
      line-height: 60px;
      background-color: #f7f7f7;
      font-size: 12px;
      text-align: center;
      
      &.active{
        background-color: white;
        position: relative;
        
        &::before{
          content: '';
          display: block;
          width: 3px;
          height: 30px;
          background-color: red;
          position: absolute;
          top: 50%;
          left: 0;
          transform: translateY(-50%);
        }
      }
    }
  }
  
  .cate-lv2-title{
    font-weight: bold;
    text-align: center;
    font-size: 12px;
    padding: 15px 0;
  }
  .cate-lv3-list{
    display: flex;
    flex-wrap: wrap;
    
    .cate-lv3-item{
      width: 33.33%;
      display: flex;
      flex-direction: column;
      justify-content: space-around;
      margin-bottom: 10px;
      align-items: center;
      image{
        width: 60px;
        height: 60px;
      }
      text{
        font-size: 12px;
      }
    }
  }
}
.search-box{
      position: sticky;
      top: 0;
      z-index: 999;
    }
</style>
